Damper is a type of opening for air or liquid. Manually, We can adjust the opening for one or two times. But frequent opening at precise control level, is difficult and not achievable.
There are special modular actuator which can adjust the damper by just little electrical signal. In Automation system, these modular damper actuator plays very important part.
What exactly is a damper actuator?
“Damper “is a type of valve or plate which is utilized to open , close or divert the air flow inside the duct, chimney and air handling equipment.
“Actuator “is machine which converts the energy into physical movement.
“Damper actuator” is assembly in which valve or plate moves when energy is get applied.
For better understanding, We are going to discuss BELIMO make modular damper actuator, Next.
Belimo GM24A-SR Damper Actuator
This Belimo GM24A-SR, contains heavy torque DC motor. The rotation of the motor depend upon the input signal. The torque from DC motor is utilized for the rotation of damper. Parallelly, Damper actuator produces the feedback output signal.
This device take 24V DC as an auxiliary supply. Input signal ranges from 2 to 10 V DC. While output feedback signal also ranges from 2 to 10 V DC. This actuator rotates the damper up to 90°C in 150 sec.
Specification Belimo GM24A-SR Damper Actuator
Electrical specification
- Torque rating : 40 Nm
- Nominal voltage : 24 V AC/DC 50/60Hz
- Complete opening time : 150 Sec. / 90°
- Power consumption : 6.5 VA 4.5 W
- Control input voltage range : 2 to 10 V DC
- Feedback voltage range, U : 2 to 10 V DC
- Feedback current U note : Max. 1mA
- Sound power level motor : 45 DB
- Number of wires : 4 (2 are nominal power supply/ 3rd is input / 4th is output
- Complete angle : 95°
- Input impedance : 100k ohm
- Position accuracy : +-5%
Other specifications
- Air damper size : up to 8 m²
- Direction : Selectable clockwise(1) or anticlockwise(0)
- Manual override : With push button / Can be locked
- Ingress protection : IP 54
- Angle of rotation note : Can be limited to both sides with adjustable mechanical end stop
- Mechanical interface : Universal shaft clamp reversible 12 . . . 26.7mm
- Degree of protection : NEMA 2
- Enclosure type : UL enclosure type 2
- Ambient temperature : -30° to 50° C
- Ambient humidity : Max. 95% RH, Non condensing
Features Belimo GM24A-SR Damper Actuator
Operating mode : Y input is a signal in which DC voltage varies from 2 to 10V DC. This input moves the damper from 0% to 100%. U is output signal having DC voltage varies from 2 to 10V DC , It is type of feedback which can be considered as % of opening. This U output can also be given as an input to another actuator.
Simple direct mounting : Universal shaft clamp make it easy to clamp the shaft. This clamp is having special feature which prevents the movement of actuator.
Manual Override : With push button, actuator can get manually locked. With this manual button gear train is get disengaged for as long as this manual button is pressed.
Adjustable angle of rotation : Adjustable angle rotation with mechanical end stops.
High functional relability : The actuator is overload protected. No limit switch required. It automatically stop when it reached the end stops
Easy direction change : Direction is easily changeable with variable nobe which has two options 0 and 1. With 0 selection, It moves anti-clockwise. With 1 selection, It moves clock wise.
WORKING- Belimo GM24A-SR Damper Actuator
Auxiliary 24 V DC supply is readily available across the actuator. It only needs an input V DC signal for operating, Signal ranges from 2 to 10 VDC. At 2 V DC, It positioned the damper at 0°. At 10 V DC, Damper is get positioned to 90°. For that complete cycle damper needs a time of 150 sec.
As the input signal voltage increases, The angle of damper increases gradually. This can be understand through a graph below. In a graph, Input DC signal placed at horizontal X- axis ranges from 2 to 10 V DC. Damper angle is placed vertical side Y-axis ranges from 0 to 90°.
Apart from, This damper actuator produces the feedback signal according to its position. Feedback signal voltage ranges from 2 to 10 V DC.
Terminals and wiring- Belimo GM24A-SR Damper Actuator
There are total 4 terminals.
- Where 1 and 2 terminals are nominal voltage terminals. Having the voltage range 24 V DC/AC. Power is readily available across the device, It just need a control input signal for damper movement.
- Terminal 3 is input signal terminal Where voltage ranges from 2 to 10 V DC is been applied to position the damper.
- Terminal 4 ( printed 5), It is a feedback signal depending upon the damper position. It is also ranges from 2 to 10 V DC.
Difference between ON/OFF actuator and modulating actuator
| Particulars | ON/OFF actuator | Modulation actuator |
| Cost | Cheaper | Costlier |
| Separate Input signal | Not required | Depending upon model |
| Precision | Lower | Higher |
| Feedback signal | Not available generally | Depending upon model |
Summary
- A damper is a device used to control air or liquid flow, which can be adjusted manually but is challenging for precise control during frequent adjustments.
- Modular damper actuators, like the Belimo GM24A-SR, enable efficient automation by responding to small electrical signals.
- The Belimo actuator features a heavy torque DC motor that rotates the damper based on an input voltage range of 2 to 10 V DC, achieving full rotation in 150 seconds.
- This actuator provides feedback on its position and includes features like manual override, adjustable angle of rotation, and high reliability.
- It operates within specific environmental parameters and connects through four terminals for power and control signals.